My advice in few steps:
- get soe hosting and place all domains in different IP.
- put unique content in all sites - articles must be in your niche.
- get 1 site and it will be your niche site.
- all other 39 sites will be your satelite sites.
- backlink your 39 sites to your main niche site - don't worry they are on different IPs - no footprint.
to avoid footprint - use different keywords for anchor text.
- do pyramid backlink strategy for all sites.
- (additional) after few months you can redirect 5 of ypur 39 sites to your main site. Use 301 redirect. The 5 sites must have PR.
- add fresh content to your sites every month.

This is my basic micro-blog-network strategy. Will it work?
- Yes of course.Why i am sure?
- I use it. But with 20, not 40 sites.And the result?
- I am in top 3 for very hard competition niches and in 1st place of 90% of my niches.

Make sure to work on your on-page and off-page SEO. Always put quality content which are valuable to the users and a user friendly site that loads easily and can be navigated quickly. Informative content offers demand making your website to be linkable. Concentrating on user experience will encourage more people to easily like your site and they will link to it. This will drive traffic and engines will surely rank your site. It's also necessary to optimize your site. Acquire quality backlinks from various types of authority domains - article directory, web 2.0, blog posts, wiki, social bookmarking, press release, etc.

I'd do it like this. Target an easy related keyword on each of your 40 sites and rank them all. This way you will make money with your buffer sites and you will get the greatest link juice you can have for your main site. Have a diversified link structure so you can use your main keyword on as many sites as you can. And very important, treat them as your main site. A lot of work and money... Good Luck!

The dirtiest form of backlinks that can get your site flying through the serps. Although just like all good things in life, sape links will not last forever. So unless you know what your doing with them then don't mess with them because as soon as Google finds sape, your site will also get slapped. But hey their great to rank sites for a limited time and bank big, just don't think of using them on your main authority sites(if you have one that is)

If all sites are on 1 shared IP and are linked together you will make footprint.
I tried it and the result was - big fail in my serp.

Click to expand...

yes if you link them all together - just don't link the tiered sites together and treat them as if they are their own, obviously linking to the money site. If the domain is on a shared hosting account. Its unlikely that a penalty will get put on the IP as there could be 1000 unrelated domains. The penalty therefore is going to come through sites that are linking together. Treating each tier 1 as its own entity in theory (in a 10 site build) one could get spanked and the other 9 will still be ok. If all 10 link to each other then you are going to start seeing a trickle effect from the big G

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